CN113482980B - Mold opening and closing differential circuit of tire vulcanizer - Google Patents
Mold opening and closing differential circuit of tire vulcanizer Download PDFInfo
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- CN113482980B CN113482980B CN202110727425.2A CN202110727425A CN113482980B CN 113482980 B CN113482980 B CN 113482980B CN 202110727425 A CN202110727425 A CN 202110727425A CN 113482980 B CN113482980 B CN 113482980B
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- 239000003921 oil Substances 0.000 claims description 283
- 239000010720 hydraulic oil Substances 0.000 claims description 19
- 230000005484 gravity Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/20—Opening, closing or clamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a die opening and closing differential loop of a tire vulcanizer, which comprises a die opening and closing oil cylinder, an electrohydraulic reversing valve, a second electromagnetic ball valve and a logic valve; the electrohydraulic reversing valve is provided with a first oil port communicated with the main oil inlet, a second oil port communicated with the main oil return port, a third oil port communicated with the rodless cavity of the mold opening and closing oil cylinder and a fourth oil port communicated with the rod cavity of the mold opening and closing oil cylinder; the oil inlet of the second electromagnetic ball valve is communicated with the main oil inlet; the logic valve comprises a fifth oil port which is communicated with the fourth oil port and the rod cavity of the die opening and closing oil cylinder, a sixth oil port which is communicated with the third oil port and the rodless cavity of the die opening and closing oil cylinder, and a seventh oil port which is communicated with the oil outlet of the second electromagnetic ball valve. The open-close die differential loop of the tire vulcanizer has low requirements on the flow capacity of the reversing valve; the differential circuit has small pressure loss; the oil cylinder does not slide down when the mold opening and closing oil cylinder opens and closes.
Description
Technical Field
The invention relates to the technical field of hydraulic control of vulcanizing machines, in particular to an open-close die differential loop of a tire vulcanizing machine.
Background
The realization of the existing mold opening and closing differential circuit of the tire vulcanizer generally adopts the following three hydraulic circuits: (1) The one-way valve is used for guiding the oil with the rod cavity back to the P port of the reversing valve, so that differential motion is realized; (2) The electromagnetic ball valve is used for communicating the rodless cavity with the rod cavity, so that differential motion is realized; (3) The logic valve is used for leading control oil of the logic valve to be communicated with the T port, so that the rodless cavity and the rod cavity are communicated, and differential motion is realized. The above-described split-die differential loop has the following disadvantages: the differential loop is realized through the reversing valve by using the one-way valve, the oil passing amount of the reversing valve is increased, and the reversing valve with larger diameter is needed to be selected; the electromagnetic ball valve is used for communicating the rodless cavity with the rod cavity to realize differential motion, and the pressure loss is large because the through-flow capacity of the electromagnetic ball valve is smaller; the logic valve is used for controlling the oil to release pressure, the rodless cavity and the rod cavity are communicated to realize differential motion, and the phenomenon of oil cylinder sliding down occurs when the oil cylinder is started and stopped.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a differential die opening and closing differential loop of a tire vulcanizer, which is characterized in that a rod cavity and a rodless cavity are communicated through a logic valve, the circulation capacity of a reversing valve is not required to be increased, and the die opening and closing can be prevented from sliding downwards.
In order to achieve the above purpose, the invention provides an opening and closing die differential loop of a tire vulcanizer, which comprises an opening and closing die cylinder, an electro-hydraulic reversing valve, a second electromagnetic ball valve and a logic valve;
the electrohydraulic reversing valve is provided with a first oil port communicated with the main oil inlet, a second oil port communicated with the main oil return port, a third oil port communicated with the rodless cavity of the mold opening and closing oil cylinder and a fourth oil port communicated with the rod cavity of the mold opening and closing oil cylinder;
the oil inlet of the second electromagnetic ball valve is communicated with the main oil inlet;
the logic valve comprises a fifth oil port which is communicated with the fourth oil port and the rod cavity of the mold opening and closing oil cylinder at the same time, a sixth oil port which is communicated with the third oil port and the rod-free cavity of the mold opening and closing oil cylinder at the same time, and a seventh oil port which is communicated with the oil outlet of the second electromagnetic ball valve;
the electro-hydraulic reversing valve is provided with a first switch for controlling the on-off of the first oil port and the third oil port and a second switch for controlling the on-off of the second oil port and the fourth oil port, and the second electromagnetic ball valve is provided with a fourth switch.
Preferably, the device further comprises a balance valve;
an oil inlet of the balance valve is communicated with the third oil port, and an oil outlet of the balance valve is communicated with the seventh oil port;
and an overflow port of the balance valve is communicated with the fourth oil port.
Preferably, the device further comprises a first electromagnetic ball valve;
an oil inlet of the first electromagnetic ball valve is communicated with an overflow port of the balance valve, and an oil outlet of the first electromagnetic ball valve is communicated with the fifth oil port;
the first electromagnetic ball valve is provided with a third switch.
The oil inlet of the overflow valve is communicated with the oil outlet of the first electromagnetic ball valve, and the oil outlet of the overflow valve is communicated with the main oil return port.
The mold opening and closing oil cylinder comprises two oil cylinders which are arranged in parallel, the seventh oil port is simultaneously communicated with rodless cavities of the two oil cylinders, and the fifth oil port is simultaneously communicated with rod cavities of the two oil cylinders.
As a preferable scheme, a first branch pipeline is further connected to a pipeline between the seventh oil port and the rodless cavity of the mold opening and closing oil cylinder, and a first one-way valve is arranged on the first branch pipeline; and a second branch pipeline is further connected to a pipeline between the fifth oil port and the rod cavity of the mold opening and closing oil cylinder, and a second one-way valve is arranged on the second branch pipeline.
Compared with the prior art, the invention has the beneficial effects that:
the mold opening and closing differential loop of the tire vulcanizer comprises a mold opening and closing oil cylinder, an electrohydraulic reversing valve, a second electromagnetic ball valve and a logic valve; the electrohydraulic reversing valve is provided with a first oil port communicated with the main oil inlet, a second oil port communicated with the main oil return port, a third oil port communicated with the rodless cavity of the mold opening and closing oil cylinder and a fourth oil port communicated with the rod cavity of the mold opening and closing oil cylinder; the oil inlet of the second electromagnetic ball valve is communicated with the main oil inlet; the logic valve comprises a fifth oil port which is communicated with the fourth oil port and the rod cavity of the mold opening and closing oil cylinder, a sixth oil port which is communicated with the third oil port and the rod-free cavity of the mold opening and closing oil cylinder, and a seventh oil port which is communicated with the oil outlet of the second electromagnetic ball valve.
The electro-hydraulic reversing valve in the application is provided with a first switch for controlling the on-off of the first oil port and the third oil port and a second switch for controlling the on-off of the second oil port and the fourth oil port, and the second electromagnetic ball valve is provided with the fourth switch.
When the mold opening and closing oil cylinder is required to be driven to open the mold, the first switch and the fourth switch are opened, wherein the hydraulic oil can directly enter the rodless cavity of the mold opening and closing oil cylinder from the main oil inlet by opening the first switch; after the fourth switch is opened simultaneously, the pressure of a seventh oil port of the logic valve is the same as the pressure of the main oil inlet, hydraulic oil enters a buffer cavity of the logic valve, which is provided with a spring, the logic valve cannot be opened immediately, and hydraulic oil in a rodless cavity of the mold opening and closing oil cylinder cannot flow to a rod cavity through the logic valve under the action of the gravity of the mold to cause the oil cylinder to slide downwards, so that the phenomenon of sliding downwards of the mold opening and closing oil cylinder is avoided during starting; because the area difference ratio exists in the mold opening and closing oil cylinder, the pressure of the rod cavity of the mold opening and closing oil cylinder is about 2 times of the pressure of the rodless cavity, the pressure of the fifth oil port of the logic valve is larger than the pressure of the sixth oil port of the logic valve, the sum of the pressure of the fifth oil port of the logic valve and the pressure of the sixth oil port is larger than the pressure of the seventh oil port and overcomes the elasticity of the spring of the logic valve, the logic valve is opened, and hydraulic oil in the rod cavity of the mold opening and closing oil cylinder returns to the rodless cavity through the fifth oil port and the sixth oil port of the logic valve to form a differential loop, so that the mold opening and closing can be realized quickly.
When the die is closed, the first switch and the fourth switch are electrically closed, the pressure of the seventh oil port of the logic valve is disconnected from the P port, at the moment, the pressure of the seventh oil port of the logic valve depends on the oil port with higher pressure of the fifth oil port and the sixth oil port of the logic valve, and the area of a buffer cavity communicated with the seventh oil port of the logic valve is far larger than the area of a cavity communicated with the other two oil ports, so that the logic valve can be quickly closed under the cooperation of the spring force in the buffer cavity of the logic valve, and the pressure of the sixth oil port can be closed with little pressure drop, so that the die opening and closing oil cylinder cannot slide down.
The mold opening and closing differential loop of the tire vulcanizer is communicated with a rod cavity and a rodless cavity of an oil cylinder through a logic valve to form a differential loop, oil in the rod cavity does not pass through a reversing valve, and the requirement on the flow capacity of the reversing valve is low; the through-flow capacity of the logic valve is stronger than that of the electromagnetic ball valve, and the pressure loss of the differential circuit is small; the pilot oil port of the logic valve is connected to the main oil inlet port instead of the main oil outlet port, and the oil cylinder does not slide down when the mold opening and closing cylinder opens and closes.
Drawings
FIG. 1 is a schematic diagram of the differential loop of the mold opening and closing of the tire curing machine of the present invention.
In the figure, 1, a mold opening and closing oil cylinder; 2. electro-hydraulic reversing valve; 21. a first oil port; 22. a second oil port; 23. a third oil port; 24. a fourth oil port; 3. a second electromagnetic ball valve; 4. a logic valve; 41. a fifth oil port; 42. a sixth oil port; 43. a seventh oil port; YV1, first switch; YV2, second switch; YV3, third switch; YV4, fourth switch; 5. a balancing valve; 6. a first electromagnetic ball valve; 7. and an overflow valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
Referring to fig. 1 specifically, the preferred embodiment of the mold opening and closing differential circuit of the tire vulcanizer comprises a mold opening and closing oil cylinder 1 of the tire vulcanizer, an electro-hydraulic reversing valve 2, a second electromagnetic ball valve 3 and a logic valve 4; the push rod of the mold opening and closing oil cylinder 1 moves up and down, the volume of the rodless cavity is increased when the push rod moves up, mold opening is realized, and the volume of the rodless cavity is increased when the push rod moves down, and mold closing is realized. The electrohydraulic reversing valve 2 is provided with a first oil port 21 communicated with a main oil inlet P, a second oil port 22 communicated with a main oil return port T, a third oil port 23 communicated with a rodless cavity of the mold opening and closing oil cylinder 1 and a fourth oil port 24 communicated with a rod-containing cavity of the mold opening and closing oil cylinder, wherein when the first oil port 21 and the third oil port 23 are communicated, hydraulic oil of the main oil inlet P can flow to the rodless cavity of the mold opening and closing oil cylinder 1; the oil inlet of the second electromagnetic ball valve 3 is also communicated with the main oil inlet P; the logic valve 4 comprises a fifth oil port 41 which is communicated with the fourth oil port 24 and the rod cavity of the mold opening and closing oil cylinder 1, a sixth oil port 42 which is communicated with the third oil port 23 and the rodless cavity of the mold opening and closing oil cylinder 1, and a seventh oil port 43 which is communicated with the oil outlet of the second electromagnetic ball valve 3, wherein when the switch of the second electromagnetic ball valve 3 is opened, the pressure of hydraulic oil of the main oil inlet P is the same as the pressure of hydraulic oil of the seventh oil port 43 after passing through the second electromagnetic ball valve 3.
The electro-hydraulic reversing valve is provided with a first switch YV1 for controlling the on-off of a first oil port 21 and a third oil port 23, a second switch YV2 for controlling the on-off of a second oil port 22 and a fourth oil port 24, and a fourth switch YV4 on the second electromagnetic ball valve 3.
Wherein, the cavity communicated with the seventh oil port 43 in the logic valve 4 is a buffer cavity, and a buffer spring is arranged in the buffer cavity; the cavity of the logic valve 4 communicated with the fifth oil port 41 is a fifth cavity, the cavity of the logic valve 4 communicated with the sixth oil port 42 is a sixth cavity, the area of the buffer cavity is 1.8 times of that of the fifth cavity, and the area of the buffer cavity is 2.25 times of that of the sixth cavity. When the fourth switch YV4 is opened, the pressure in the buffer cavity is the same as the pressure of the main oil inlet.
When the mold opening and closing oil cylinder 1 needs to be driven to perform mold opening, the first switch 21 and the fourth switch 24 are opened, wherein the opening of the first switch 21 can enable hydraulic oil to directly enter a rodless cavity of the mold opening and closing oil cylinder 1 from the main oil inlet P; after the fourth switch YV4 is opened, the pressure of the seventh oil port 43 of the logic valve 4 is the same as the pressure of the main oil port P, hydraulic oil enters a buffer cavity of the logic valve 4, which is provided with a spring, the logic valve 4 cannot be opened immediately, and hydraulic oil of a rodless cavity of the mold opening and closing oil cylinder 1 cannot flow to a rod cavity through the logic valve 4 under the action of the gravity of a mold to cause the oil cylinder to slide downwards, so that the mold opening and closing oil cylinder 1 does not slide downwards during starting; because the area difference ratio exists in the mold opening and closing oil cylinder 1, the pressure of the rod cavity of the mold opening and closing oil cylinder 1 is about 2 times of the pressure of the rodless cavity, the pressure of the fifth oil port 41 of the logic valve 4 is larger than the pressure of the sixth oil port 42 of the logic valve 4, the pressure of the fifth oil port 41 gradually increases along with the pressure of the fifth oil port 41, and after the sum of the pressure of the fifth oil port 41 and the pressure of the sixth oil port 42 of the logic valve 4 is larger than the pressure of the seventh oil port 43 and overcomes the elasticity of the spring of the logic valve 4, the logic valve 4 is opened, and hydraulic oil in the rod cavity of the mold opening and closing oil cylinder 1 returns to the rodless cavity through the fifth oil port 41 and the sixth oil port 42 of the logic valve 4 in sequence, so that a differential loop is formed, and quick mold opening is realized.
When the die is closed, the first switch YV1 and the fourth switch YV4 are powered off and closed, the pressure of the seventh oil port 43 of the logic valve 4 is disconnected from the main oil inlet P port, at this time, the pressure of the seventh oil port 43 of the logic valve 4 depends on the oil ports with higher pressures of the fifth oil port 41 and the sixth oil port 42 of the logic valve 4, and the area of a buffer cavity communicated with the seventh oil port 43 of the logic valve 4 is far larger than the cavity areas of the fifth cavity and the sixth cavity, so that the logic valve can be quickly closed under the cooperation of the spring force in the buffer cavity of the logic valve 4, and at this time, the pressure of the sixth oil port 42 is extremely reduced, so that the logic valve 4 can be closed, and the die opening and closing cylinder 1 cannot slide down.
Wherein, in order to balance the pressure on the pipeline between the third oil port 23 and the sixth oil port 42, the open-close die differential loop of the tire vulcanizer also comprises a balance valve 5; specifically, the oil inlet of the balance valve 5 is communicated with the third oil port 23, and the oil outlet of the balance valve 5 is communicated with the seventh oil port 43; the overflow port of the balancing valve 5 is communicated with the fourth oil port 24 for flowing the overflowed hydraulic oil back to the main oil return port T.
Further, in order to conveniently control the mold opening and closing action of the tire vulcanizer, the mold opening and closing differential circuit of the tire vulcanizer further comprises a first electromagnetic ball valve 6; specifically, the oil inlet of the first electromagnetic ball valve 6 is communicated with the overflow port of the balance valve 5 and is communicated with the fourth oil port 24, and is used for controlling an oil return pipeline of hydraulic oil; the oil outlet of the first electromagnetic ball valve 6 is communicated with the fifth oil port 41, the first electromagnetic ball valve 6 is provided with a third switch, and the third switch is used for controlling the on-off of the first electromagnetic ball valve 6 so as to control hydraulic oil to flow back to the main oil return port T through the electro-hydraulic reversing valve 2 during die assembly.
Furthermore, in order to avoid the excessive pressure of the oil return pipeline of the hydraulic oil, the open-close die differential loop of the tire vulcanizer further comprises an overflow valve 7, wherein an oil inlet of the overflow valve 7 is communicated with an oil outlet of the first electromagnetic ball valve 6, and an oil outlet of the overflow valve 7 is communicated with a main oil return port T.
In the embodiment of the application, the mold opening and closing oil cylinder 1 specifically comprises two oil cylinders which are arranged in parallel, the seventh oil port 43 is simultaneously communicated with rodless cavities of the two oil cylinders, and the fifth oil port 41 is simultaneously communicated with rod cavities of the two oil cylinders.
In the embodiment of the present application, a first branch pipeline is further connected to a pipeline between the seventh oil port 43 and the rodless cavity of the mold opening and closing cylinder 1, and a first check valve is arranged on the first branch pipeline; a second branch pipeline is also connected to the pipeline between the fifth oil port 41 and the rod cavity of the mold opening and closing oil cylinder 1, and a second one-way valve is arranged on the second branch pipeline.
The mold opening and closing differential loop of the tire vulcanizer is communicated with a rod cavity and a rodless cavity of an oil cylinder through a logic valve 4 to form a differential loop, oil in the rod cavity does not pass through a reversing valve, and the requirement on the flow capacity of the reversing valve is low; the through-flow capacity of the logic valve 4 is stronger than that of the electromagnetic ball valve, the pressure loss of the logic valve is smaller than that of the electromagnetic ball valve, and the pressure loss of the differential circuit is smaller; the pilot oil port of the logic valve 4 is connected to the main oil inlet P instead of the main oil outlet T, so that the oil cylinder does not slide down when the mold opening and closing oil cylinder 1 opens and closes.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (4)
1. The mold opening and closing differential loop of the tire vulcanizer is characterized by comprising an mold opening and closing oil cylinder, an electrohydraulic reversing valve, a second electromagnetic ball valve and a logic valve;
the electrohydraulic reversing valve is provided with a first oil port communicated with the main oil inlet, a second oil port communicated with the main oil return port, a third oil port communicated with the rodless cavity of the mold opening and closing oil cylinder and a fourth oil port communicated with the rod cavity of the mold opening and closing oil cylinder;
the oil inlet of the second electromagnetic ball valve is communicated with the main oil inlet;
the logic valve comprises a fifth oil port which is communicated with the fourth oil port and the rod cavity of the mold opening and closing oil cylinder at the same time, a sixth oil port which is communicated with the third oil port and the rod-free cavity of the mold opening and closing oil cylinder at the same time, and a seventh oil port which is communicated with the oil outlet of the second electromagnetic ball valve;
the electro-hydraulic reversing valve is provided with a first switch for controlling the on-off of the first oil port and the third oil port and the on-off of the second oil port and the fourth oil port and a second switch for controlling the on-off of the first oil port and the fourth oil port and the on-off of the second oil port and the third oil port, and a fourth switch is arranged on the second electromagnetic ball valve;
the device also comprises a one-way balance valve;
an oil inlet of the balance valve is communicated with the third oil port, and an oil outlet of the balance valve is communicated with the sixth oil port and the rodless cavity;
the hydraulic control port of the balance valve is communicated with the fourth oil port;
the device also comprises a first electromagnetic ball valve;
an oil inlet of the first electromagnetic ball valve is communicated with a hydraulic control port of the balance valve, and an oil outlet of the first electromagnetic ball valve is communicated with the fifth oil port and the rod cavity;
the first electromagnetic ball valve is provided with a third switch;
the cavity communicated with the seventh oil port in the logic valve is a buffer cavity, and a buffer spring is arranged in the buffer cavity; the cavity of the logic valve communicated with the fifth oil port is a fifth cavity, and the cavity of the logic valve communicated with the sixth oil port is a sixth cavity;
when the mold opening and closing oil cylinder is required to be driven to open the mold, the first switch and the fourth switch are opened, wherein the hydraulic oil can directly enter the rodless cavity of the mold opening and closing oil cylinder from the main oil inlet by opening the first switch; after the fourth switch is opened, the pressure of a seventh oil port of the logic valve is the same as the pressure of the main oil inlet, hydraulic oil enters a buffer cavity of the logic valve, which is provided with a buffer spring, the logic valve cannot be opened immediately, and hydraulic oil of a rodless cavity of the mold opening and closing oil cylinder cannot flow to a rod cavity through the logic valve under the action of the gravity of the mold to cause the oil cylinder to slide downwards, so that the mold opening and closing oil cylinder does not slide downwards during starting; because the area difference ratio exists in the mold opening and closing oil cylinder, the pressure of the rod cavity of the mold opening and closing oil cylinder is about 2 times of the pressure of the rodless cavity, the pressure of the fifth oil port of the logic valve is larger than the pressure of the sixth oil port of the logic valve, the pressure of the fifth oil port of the logic valve gradually increases along with the pressure of the fifth oil port, after the sum of the pressure of the fifth oil port of the logic valve and the pressure of the sixth oil port is larger than the pressure of the seventh oil port and overcomes the elasticity of the spring of the logic valve, the logic valve is opened, and hydraulic oil in the rod cavity of the mold opening and closing oil cylinder returns to the rodless cavity through the fifth oil port and the sixth oil port of the logic valve in sequence, so that a differential loop is formed, and quick mold opening is realized;
when the die is assembled, the first switch and the fourth switch are electrically closed, the pressure of the seventh oil port of the logic valve is disconnected from the main oil inlet, at the moment, the pressure of the seventh oil port of the logic valve depends on the oil port with higher pressure of the fifth oil port and the sixth oil port of the logic valve, and the area of a buffer cavity communicated with the seventh oil port of the logic valve is far larger than the areas of the cavities of the fifth cavity and the sixth cavity, so that the logic valve can be rapidly closed under the cooperation of spring force in the buffer cavity of the logic valve.
2. The differential mold opening and closing circuit of a tire curing press as set forth in claim 1, further comprising an overflow valve having an oil inlet in communication with an oil outlet of the first electromagnetic ball valve and an oil outlet in communication with a main oil return.
3. The differential mold opening and closing circuit of a tire vulcanizer as set forth in claim 1, wherein said mold opening and closing cylinder comprises two cylinders arranged in parallel, said sixth port being in communication with the rodless cavities of both said cylinders simultaneously, said fifth port being in communication with the rod cavities of both said cylinders simultaneously.
4. The differential mold opening and closing loop of the tire vulcanizing machine as claimed in claim 1, wherein a first branch pipeline is further connected to a pipeline between the sixth oil port and the rodless cavity of the mold opening and closing cylinder, and a first check valve is arranged on the first branch pipeline; and a second branch pipeline is further connected to a pipeline between the fifth oil port and the rod cavity of the mold opening and closing oil cylinder, and a second one-way valve is arranged on the second branch pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110727425.2A CN113482980B (en) | 2021-06-29 | 2021-06-29 | Mold opening and closing differential circuit of tire vulcanizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110727425.2A CN113482980B (en) | 2021-06-29 | 2021-06-29 | Mold opening and closing differential circuit of tire vulcanizer |
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| Publication Number | Publication Date |
|---|---|
| CN113482980A CN113482980A (en) | 2021-10-08 |
| CN113482980B true CN113482980B (en) | 2024-02-13 |
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| CN202110727425.2A Active CN113482980B (en) | 2021-06-29 | 2021-06-29 | Mold opening and closing differential circuit of tire vulcanizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115674608B (en) * | 2023-01-03 | 2023-05-09 | 山西斯普瑞机械制造股份有限公司 | Valve special for automatically adjusting opening and closing die of shoe vulcanizing machine |
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| JPH0714203U (en) * | 1993-08-13 | 1995-03-10 | 株式会社小松製作所 | Vibration suppressor for work equipment |
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